/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlets;

import facebook.Utilities;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Antonio
 */
@WebServlet(name = "ManageUserSessionServlet", urlPatterns = {"/ManageUserSessionServlet"})
public class ManageUserSessionServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HttpSession s = request.getSession();
        if (request.getParameter("session") != null) {
            s.invalidate();
            System.out.println("Session deleted");
            response.sendRedirect(Utilities.getBaseUrl(request));
        }
        else if (s.getAttribute("userid") == null) {
            String userId = request.getParameter("user_id");
            String accessToken = request.getParameter("access_token");
            s.setAttribute("userid", userId);
            s.setAttribute("token", accessToken);
            System.out.println("Session has been set");
            response.sendRedirect(Utilities.getBaseUrl(request));
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
